methylene blue

methylene blue

a bluish-green aniline dye, CHNClS3HO, used as a bacteriologic stain, an antidote in cyanide poisoning, etc.

methylene blue

noun

A heterocyclic aromatic compound, C16H18N3SCl · 3H2O, consisting of dark green crystals that form a deep blue solution when dissolved in water. It is used as an antidote for cyanide poisoning, an analytical indicator, and a bacteriological stain.